Question

The resistance of a wire is R. It is stretched
uniformly so that its length is doubled. The
resistance now becomes:
(a) 2R
(b) R2
(c) 4R
(d) R/4​

Answer 1

Answer:

4R

Explanation:

R directly proportional to l^2

Answer 2

Answer:

The new resistance will become (c)4R

Explanation:

Since after stretching

length will twice , and length is directly proportional to R

and

Area of crossection will be halved which is inversely proportional to r

So The resistance increase 4 time